EP0730156A1 - Verfahren und Vorrichtung zur Überwachung der Geschwindigkeit eines Gleichstrommotors - Google Patents

Verfahren und Vorrichtung zur Überwachung der Geschwindigkeit eines Gleichstrommotors Download PDF

Info

Publication number
EP0730156A1
EP0730156A1 EP96300537A EP96300537A EP0730156A1 EP 0730156 A1 EP0730156 A1 EP 0730156A1 EP 96300537 A EP96300537 A EP 96300537A EP 96300537 A EP96300537 A EP 96300537A EP 0730156 A1 EP0730156 A1 EP 0730156A1
Authority
EP
European Patent Office
Prior art keywords
motor
frequency
signal
negative terminal
predetermined value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96300537A
Other languages
English (en)
French (fr)
Other versions
EP0730156B1 (de
Inventor
Gregory J. Dygert
Harold R. Macks
Steven P. Nimer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Motor Co
Original Assignee
Ford Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Publication of EP0730156A1 publication Critical patent/EP0730156A1/de
Application granted granted Critical
Publication of EP0730156B1 publication Critical patent/EP0730156B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S388/00—Electricity: motor control systems
    • Y10S388/90—Specific system operational feature
    • Y10S388/903—Protective, e.g. voltage or current limit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S388/00—Electricity: motor control systems
    • Y10S388/907—Specific control circuit element or device
    • Y10S388/909—Monitoring means

Definitions

  • the present invention relates to the field of DC motors, and more particularly to DC motor speed monitoring and diagnostics.
  • Direct current (DC) motors are used for numerous applications. In many of those applications, it is desirable to know the speed at which the motor is running. Knowledge of the speed of the motor can help facilitate closed-loop control of the speed of the motor. Further, knowledge of the speed of the motor can be used to help detect motor fault conditions. For example, a motor can become mechanically overloaded. Such mechanical overloading can reduce the speed of the motor such that it does not operate as designed, as well as cause the motor to draw electrical currents above intended values.
  • One way to measure speed of a motor is to monitor the commutator signal of the motor.
  • the frequency of this signal is proportional to the speed of a DC motor having brushes. Further, the frequency of the signal is proportional in almost all cases to the speed of a brushless DC motor.
  • monitoring the commutator signal requires that an additional terminal be provided at the motor (as an output for the commutator signal) and at the controller for the motor (as an input for monitoring the commutator signal).
  • Such increased terminal count increases the cost and decreases the reliability of the system.
  • cost constraints and reliability requirements are particularly stringent.
  • a speed monitoring system for a DC motor which would not require the additional terminals herein described would provide cost and reliability advantages.
  • the present invention provides a method for monitoring the speed of a DC motor.
  • the method comprises the step of providing a DC motor having a positive terminal and a negative terminal, the positive terminal coupled to a positive-voltage power source and the negative terminal coupled to a voltage lower than the voltage of the positive-voltage power source.
  • the method also includes the step of detecting the frequency of a signal at the negative terminal of the motor.
  • the present invention further provides an apparatus for monitoring the speed of a DC motor.
  • the apparatus includes a DC motor with a positive terminal and a negative terminal, the positive terminal coupled to a positive-voltage power source and the negative terminal coupled to a voltage lower than the voltage of the positive-voltage power source. Further, the apparatus comprises a frequency detection circuit coupled to the negative terminal of the motor.
  • the present invention also provides an apparatus for monitoring the speed of a DC motor.
  • the apparatus comprises a DC motor with a positive terminal and a negative terminal, the positive terminal coupled to a positive-voltage power source and the negative terminal coupled to a voltage lower than the voltage of the positive-voltage power source.
  • the apparatus additionally includes means for detecting the frequency of a signal on the negative terminal of the motor.
  • the present invention enables the monitoring of the speed of a DC motor without adding terminals either to the motor or to the motor controller. In doing so, the invention provides cost and reliability advantages over alternative systems and methods for monitoring the speed of a DC motor.
  • Figure 1 illustrates motor 12 and controller 14.
  • Motor 12 is a brushless DC motor.
  • motor 12 is connected at its positive terminal to ignition voltage of a motor vehicle (nominally 12 volts).
  • the negative terminal of motor 12 is connected to ground through resistor 20 within electronic module 14.
  • motor 12 is intended in this case to be operated at a single speed, always intended to have a constant nominal voltage (here 12 volts) across it.
  • Electronic module 14 can provide a number of functions on the motor vehicle in which it is installed. One of such functions is monitoring the speed of motor 12. Another such function is logging and/or communicating a malfunction indication if the speed of motor 12 is out of its normal operating range.
  • Electronic module 14 monitors the signal at the negative terminal of motor 12. That signal (which is also at node 21 within electronic module 14) is illustrated as curve (a) in Figure 2. This curve illustrates that the signal at node 21 has an alternating current (AC) component as well as a direct current (DC) offset. The AC component is a consequence of the commutation occurring within motor 12.
  • AC alternating current
  • DC direct current
  • capacitor 22 provides a small amount of low-pass filtering to remove high frequency noise from the signal on the negative terminal of motor 12.
  • Capacitor 24 then provides high-pass filtering of the signal, to extract the alternating current (AC) component of the signal.
  • the signal at node 25 i.e., the output of the high-pass-filtering provided by capacitor 24
  • curve (b) illustrates that the DC offset shown in curve (a) is now substantially removed.
  • the signal is next fed into the non-inverting input of comparator 26.
  • the inverting input of comparator 26 is connected to ground.
  • Comparator 26 converts the signal at node 25 into a square wave, illustrated as curve (c) at Figure 2.
  • the square wave has a "high” amplitude (preferably 5 volts) when the signal at node 25 is greater than zero volts, and a "low” amplitude (preferably near zero volts) when the signal at node 25 is less than zero volts.
  • Microprocessor 16 then takes the square wave produced by comparator 26 and measures its frequency. (Those skilled in the art will recognise that there numerous ways for microprocessor 16 to measure frequency, including both hardware and software timers. Any such method of measuring frequency will work in the present invention.) If a 68HC11-series microprocessor is used, the square wave can be connected to an "input capture" input of microprocessor 16. When an edge of the square wave occurs, an interrupt is generated. The software in the microprocessor can then determine the elapsed time since the last pulse of the square wave, thus determining the frequency of the signal. The frequency of the signal is proportional to the speed of motor 12 for all cases except when motor 12 is stalled. When a brushless DC motor is stalled, the commutation signal generated by electronics within the motor typically goes to a high frequency. That frequency is reflected in the signal measured at node 21.
  • Microprocessor 16 compares the measured frequency against two predetermined frequencies.
  • the first predetermined frequency is a lower limit for the acceptable speed of motor 12. This limit is preferably a function of ignition voltage, because the speed of motor 12 is a function of ignition voltage. If the measured frequency is below this lower limit, microprocessor 16 recognises that motor 12 is rotating too slowly. The likely cause of this condition is an obstruction which slows the motor's rotation. Microprocessor 16 then provides a malfunction indication through (for example) lighting a warning lamp, logging a diagnostic trouble code in memory within electronic module 14, and/or communicating to another electronic device on the vehicle that motor 12 is not rotating within its intended speed range.
  • the second predetermined frequency is an upper limit of acceptable frequency.
  • the upper limit is preferably a function of ignition voltage. If the measured frequency is above the upper limit, a likely cause is motor 12 being stalled, at which point the electronics in motor 12 will typically generate the above-described commutator pulses of high frequency.
  • Microprocessor 16 then provides a malfunction indication through (for example) lighting a warning lamp, logging a diagnostic trouble code within electronic module 14, and/or communicating to another electronic device on the vehicle that motor 12 is not rotating within its intended speed range.
  • motor 42 is a motor with brushes.
  • Motor 42 is connected at its positive terminal to ignition voltage, typically 12 volts.
  • the negative terminal of motor 42 is connected to the output of motor driver module 44, which will be described in more detail below.
  • Motor driver module 44 is connected to controller 46.
  • Controller 46 comprises microprocessor 48.
  • Microprocessor 48 controls the speed of motor 42 through providing a pulse-width-modulated (PWM) signal to digital-to-analogue (D/A) converter 50.
  • PWM pulse-width-modulated
  • D/A digital-to-analogue
  • the analogue output of D/A converter 50 is provided to motor driver module 44. It can be recognised that this particular system allows controller 46 to command motor 42 at variable speeds.
  • the signal from D/A converter 50 is provided to transistor 52, whose output is coupled to the negative terminal of motor 42.
  • Transistor 52 will turn on motor 42 to a speed determined by the magnitude of the voltage of the signal provided to transistor 52 by D/A converter 50.
  • the signal at the negative terminal of motor 42 is provided through resistor 54 to controller 46.
  • capacitor 56 provides a small amount of low-pass filtering to reduce high-frequency noise.
  • the signal at node 57 is illustrated as curve (a) of Figure 2. As has been discussed in connection with the embodiment of Figure 1, the signal illustrated at curve (a) has an AC component and a DC offset.
  • the signal is then provided to capacitor 58, which high-pass-filters the signal to extract the AC component.
  • the signal at node 59 (the output of capacitor 58) is illustrated as curve (b) of Figure 2.
  • the DC offset of curve (a) is reduced or substantially removed.
  • the signal is next provided to the non-inverting input of comparator 60.
  • the inverting input of comparator 60 is connected to ground or to a voltage divider comprising resistors 62 and 64. (Whether ground or a voltage divider is used depends upon how much DC offset remains in the signal at the non-inverting input of comparator 60. Ground is preferably used if little or no DC offset remains.)
  • the output of comparator 60 is a square wave, preferably with an amplitude of 5 volts. This square wave has the 5-volt amplitude when the signal at the non-inverting input to comparator 60 is greater than the signal at the inverting input, and an amplitude near zero volts otherwise.
  • Microprocessor 48 compares the measured frequency against a predetermined frequency.
  • the predetermined frequency is a lower limit for the acceptable speed of motor 42. (This limit is preferably a function of ignition voltage and of the output voltage of D/A converter 50, because the speed of motor 42 is a function of those two variables.) If the measured frequency is below this lower limit, microprocessor 48 recognises that motor 42 is rotating too slowly. The likely cause of this condition is an obstruction which impedes or completely stalls the motor's rotation. Such a condition likely is accompanied by an excessively large current draw by motor 42. As a result, if the measured frequency is below the lower limit, microprocessor 48 turns off motor 42 as a protection measure. Microprocessor 48 can also provide a malfunction indication through (for example) lighting a warning lamp, logging a diagnostic trouble code within controller 46, and/or communicating to another electronic device on the vehicle that motor 42 has a malfunction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP96300537A 1995-03-03 1996-01-25 Verfahren und Vorrichtung zur Überwachung der Geschwindigkeit eines Gleichstrommotors Expired - Lifetime EP0730156B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/398,271 US5524168A (en) 1995-03-03 1995-03-03 Method and apparatus for DC motor speed monitoring
US398271 1995-03-03

Publications (2)

Publication Number Publication Date
EP0730156A1 true EP0730156A1 (de) 1996-09-04
EP0730156B1 EP0730156B1 (de) 2000-08-09

Family

ID=23574724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96300537A Expired - Lifetime EP0730156B1 (de) 1995-03-03 1996-01-25 Verfahren und Vorrichtung zur Überwachung der Geschwindigkeit eines Gleichstrommotors

Country Status (5)

Country Link
US (1) US5524168A (de)
EP (1) EP0730156B1 (de)
CA (1) CA2168908A1 (de)
DE (1) DE69609645T2 (de)
PT (1) PT730156E (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19729238C1 (de) * 1997-07-09 1998-08-27 Telefunken Microelectron Verfahren zum Ermitteln der Drehzahl bei mechanisch kommutierten Gleichstrommotoren
DE19834108A1 (de) * 1998-07-29 2000-02-24 Sican Gmbh Verfahren zur Bestimmung der Anzahl von Motorumdrehungen bei Elektromotoren aus Stromripplen
DE10028033A1 (de) * 2000-06-06 2001-12-13 Kostal Leopold Gmbh & Co Kg Verfahren zum Bereitstellen eines digitalen Stromrippelsignals
DE10050239A1 (de) * 2000-10-11 2002-05-02 Bosch Gmbh Robert Verfahren zur Bestimmung der Ist-Drehzahl bei sensorlosen Gleichstrommotoren
WO2002095924A1 (de) * 2001-05-21 2002-11-28 Leopold Kostal Gmbh & Co. Kg Verfahren zum korrigieren einer drehstellungsbestimmung einer antriebswelle eines kommutierten gleichstrommotors
DE102005018526A1 (de) * 2005-04-20 2006-10-26 Conti Temic Microelectronic Gmbh Verfahren zur sensorlosen Positionserfassung eines Rotors eines Elektromotors
DE102007056229A1 (de) 2007-11-22 2009-06-10 Continental Automotive Gmbh Verfahren und Vorrichtung zur Positionsbestimmung eines beweglichen Schließteils eines Fahrzeugs
EP2383879A2 (de) 2010-04-30 2011-11-02 K+G Pneumatik GmbH Verfahren und Synchronisationseinrichtung zur Synchronisierung von mindestens zwei RWA- und Lüftungsklappenantrieben

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LT4683B (lt) 1999-09-22 2000-07-25 Uždaroji Akcinė Bendrovė "Accel Elektronika" Nuolatinės srovės variklio sukimosi greičio matavimo būdas
US7190129B1 (en) 2005-12-14 2007-03-13 Visteon Global Technologies, Inc. System and method for drift compensation when using pulse count controlled motors
DE102019205312B4 (de) * 2019-04-12 2022-08-25 Audi Ag Verfahren und Vorrichtung zur Ermittlung einer Drehzahl eines elektronisch kommutierten Elektromotors

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824811A1 (de) * 1988-07-21 1990-01-25 Teves Gmbh Co Ohg Alfred Verfahren zur messung der anzahl von umdrehungen eines gleichstrommotors
DE3935585A1 (de) * 1989-10-23 1991-04-25 Dieter Prof Dr Ing Filbert Modellgestuetztes testsystem fuer elektrische maschinen/antriebe mit elektronischem drehzahlgeber ohne mechanische ankopplung

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH423942A (de) * 1965-05-25 1966-11-15 Heberlein & Co Ag Verfahren zur Drehzahl- und Drehmomentregelung eines Gleichstromnebenschlussmotors und Schaltung zur Durchführung des Verfahrens
US3936710A (en) * 1973-06-04 1976-02-03 Canon Kabushiki Kaisha Synchronous drive control system for dc motor
JPS6031192B2 (ja) * 1978-04-28 1985-07-20 山本電気工業株式会社 直流電動機の速度制御装置
DE3122621A1 (de) * 1981-06-06 1982-12-23 Dr. Johannes Heidenhain Gmbh, 8225 Traunreut Postitioniereinrichtung
JPS59153496A (ja) * 1983-02-17 1984-09-01 Mitsubishi Electric Corp インバ−タ制御装置
ZA847740B (en) * 1983-10-12 1985-05-29 Byrne & Davidson Ind Ltd Obstruction detection means
NZ207431A (en) * 1984-03-08 1989-03-29 Fisher & Paykel Pulse with modulation controls current in dc motor
US5268623A (en) * 1985-03-05 1993-12-07 Papst Licensing Gmbh D.c. motor with a current-limiting arrangement
US4684858A (en) * 1985-09-03 1987-08-04 Capetronic (Bsr) Ltd. Motor pulse extraction system
US4679112A (en) * 1986-07-31 1987-07-07 General Motors Corporation Transistor protection circuit for automotive motor control applications
US5015928A (en) * 1988-06-03 1991-05-14 Yang Tai Her Universal series motor with speed limiting circuit to protect the motor from overspeeding during relatively-small loads
DE58905173D1 (de) * 1988-11-04 1993-09-09 Europ Patent Ag Verfahren und einrichtung zur aenderung der ist-drehzahl eines mehrphasen-asynchronmotors, und zur ausfuehrung des verfahrens geeignetes motorensystem.
US5253531A (en) * 1992-04-10 1993-10-19 Walker Dana A System and method for monitoring torsional vibrations and operating parameters of rotating shafts

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3824811A1 (de) * 1988-07-21 1990-01-25 Teves Gmbh Co Ohg Alfred Verfahren zur messung der anzahl von umdrehungen eines gleichstrommotors
DE3935585A1 (de) * 1989-10-23 1991-04-25 Dieter Prof Dr Ing Filbert Modellgestuetztes testsystem fuer elektrische maschinen/antriebe mit elektronischem drehzahlgeber ohne mechanische ankopplung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"BRUSHLESS DC MOTOR FAULT DETECTION CIRCUIT", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 37, no. 12, 1 December 1994 (1994-12-01), pages 281/282, XP000487785 *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6144179A (en) * 1997-07-09 2000-11-07 Temic Telefunken Microelectronic Gmbh Method for establishing the rotational speed of mechanically commutated d.c. motors
DE19729238C1 (de) * 1997-07-09 1998-08-27 Telefunken Microelectron Verfahren zum Ermitteln der Drehzahl bei mechanisch kommutierten Gleichstrommotoren
DE19834108A1 (de) * 1998-07-29 2000-02-24 Sican Gmbh Verfahren zur Bestimmung der Anzahl von Motorumdrehungen bei Elektromotoren aus Stromripplen
DE19834108C2 (de) * 1998-07-29 2001-06-28 Sican Gmbh Verfahren zur Bestimmung der Anzahl von Motorumdrehungen bei Elektromotoren aus Stromripplen
US6861966B2 (en) 2000-06-06 2005-03-01 Leopold Kostal Gmbh & Co. Kg Method for providing a digital current fluctuation signal
DE10028033A1 (de) * 2000-06-06 2001-12-13 Kostal Leopold Gmbh & Co Kg Verfahren zum Bereitstellen eines digitalen Stromrippelsignals
DE10050239A1 (de) * 2000-10-11 2002-05-02 Bosch Gmbh Robert Verfahren zur Bestimmung der Ist-Drehzahl bei sensorlosen Gleichstrommotoren
WO2002095924A1 (de) * 2001-05-21 2002-11-28 Leopold Kostal Gmbh & Co. Kg Verfahren zum korrigieren einer drehstellungsbestimmung einer antriebswelle eines kommutierten gleichstrommotors
US6845337B2 (en) 2001-05-21 2005-01-18 Leopold Kostal Gmbh & Co. Kg Method for correcting the determination of the rotating position of a drive shaft of a commutated direct current motor
DE102005018526A1 (de) * 2005-04-20 2006-10-26 Conti Temic Microelectronic Gmbh Verfahren zur sensorlosen Positionserfassung eines Rotors eines Elektromotors
DE102005018526B4 (de) * 2005-04-20 2008-06-12 Conti Temic Microelectronic Gmbh Verfahren zur Ermittlung der Position eines Rotors eines Elektromotors
DE102007056229A1 (de) 2007-11-22 2009-06-10 Continental Automotive Gmbh Verfahren und Vorrichtung zur Positionsbestimmung eines beweglichen Schließteils eines Fahrzeugs
US8461786B2 (en) 2007-11-22 2013-06-11 Continental Automotive Gmbh Method and device for determining the position of a mobile closing part of a vehicle
EP2383879A2 (de) 2010-04-30 2011-11-02 K+G Pneumatik GmbH Verfahren und Synchronisationseinrichtung zur Synchronisierung von mindestens zwei RWA- und Lüftungsklappenantrieben
DE102010019083A1 (de) 2010-04-30 2011-11-03 K + G Pneumatik Gmbh Verfahren und Synchronisationseinrichtung zur Synchronisierung von mindestens zwei RWA- und Lüftungsklappenantrieben

Also Published As

Publication number Publication date
PT730156E (pt) 2001-01-31
EP0730156B1 (de) 2000-08-09
DE69609645D1 (de) 2000-09-14
DE69609645T2 (de) 2000-12-07
US5524168A (en) 1996-06-04
CA2168908A1 (en) 1996-09-04

Similar Documents

Publication Publication Date Title
US5524168A (en) Method and apparatus for DC motor speed monitoring
US7005860B2 (en) Insulation resistance drop detector and method of detecting state thereof
EP1921457A1 (de) Isolationsresistenzabbau-detektor und fehlerselbstdiagnoseverfahren für den isolationsresistenzabbau-detektor
US8891210B2 (en) Electronic control unit including discharging circuit with plurality of resistors connected in series
KR100477171B1 (ko) 전기구동장치에서재밍상태를검출하기위한장치
US4783631A (en) Apparatus for detecting disconnection of a speed sensor and eliminating oxide film from the sensor's connectors
US5587865A (en) Electronic control equipment for motor vehicles, particularly, electronic brake control equipment
JP2003079196A (ja) 車両用発電制御装置
JP3374543B2 (ja) 車両用交流発電機の制御装置
US7265538B2 (en) Method and device for measuring the rotational speed of a pulse-activated electric motor based on a frequency of current ripples
US6225769B1 (en) Device for operating an electric motor
GB2247999A (en) Brushless DC motor monitor
JPH0735807A (ja) センサ用短絡検出器
CN113614545B (zh) 用于确定电子换向电机的转速的方法
JP3982861B2 (ja) 回転異常検出器付ファンモータ
JP2003302421A (ja) 回転数センサの診断装置
JPH06133591A (ja) 三相誘導モータを用いたコンプレッサの制御回路
KR100245641B1 (ko) 전기자동차의 이상전압 검출회로
JP2002345298A (ja) 車両用発電機の制御装置
KR20050105325A (ko) 차량용 속도 센서의 전원 제어 장치
KR0154889B1 (ko) 마이콤의 에러 검출회로
KR950005357B1 (ko) 리플감지에 의해 제어되는 원터치 파워윈도우
RU2256183C2 (ru) Устройство для контроля частоты вращения
JP3060400B2 (ja) インバータ監視装置
JPS63228987A (ja) エンコ−ダ付直流電動機の安全保護装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB PT

17P Request for examination filed

Effective date: 19961111

17Q First examination report despatched

Effective date: 19990118

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB PT

REF Corresponds to:

Ref document number: 69609645

Country of ref document: DE

Date of ref document: 20000914

ET Fr: translation filed
REG Reference to a national code

Ref country code: PT

Ref legal event code: SC4A

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20001013

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20011214

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20011217

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20011226

Year of fee payment: 7

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020731

REG Reference to a national code

Ref country code: PT

Ref legal event code: MM4A

Free format text: LAPSE DUE TO NON-PAYMENT OF FEES

Effective date: 20020731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030125

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030801

GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030930

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010125